What kind of Internet connection is it? Since you say, 8 Mbps, I'm
guessing either a DSL or Cable modem connection; these are the only 8
Mbps Internet connections I'm aware of.
Those connections are asymmetric. The 8 Mbps would only apply TO your
system. The upload speed is typically much slower; in fact, 3 Mbps
sounds like you would be getting a very good speed; it can often be as
slow as 1 Mbps or less.
If you have a different type of Internet connection, obviously that does
not apply.
Marc DeTrano wrote:
> I am having a problem where Bacula backups of Windows machines are
> running slow, only when saving to a storage daemon across the internet.
> Here's what I have so far:
>
> -Bacula Director and Local SD, 2.2.8, running on Mandriva Linux 2008.1
> -Remote SD 2.4.2, running on RHEL 4
> -Windows FD, 2.4.3, running on Windows Server 2003 R2
> -Remote connection is an 8Mbps line.
>
> The trouble is, the backups of Windows machines to the remote storage
> never exceed about 3Mbps.
>
> -I tried the exact same backup job, running to local storage, and it
> zipped right along (peaking at about 30 Mbps or so).
> -Remote backups of Linux machines nearly reach the full 8Mbps available.
> -Disabling/Enabling VSS did not make a difference.
> -Disabling/Enabling Compression did not make a difference.
> -I have tried various settings for Maximum Network Buffer Size, setting
> the same for both the FD and the SD, or also trying with just the FD
> - At 65535, the remote backups experience a lot of problems
> (eventually die).
> - At 32768, the remote backups are stable, just with this 3Mbps limit.
> - Above 32768, same limit
> - 16000, and they run slower.
>
> -FTP file transfers from the Windows machines to the same remote server
> with the SD can also reach the full 8Mbps.
>
> -I have not made any changes to the GlobalMaxTcpWindowSize registry
> entry (not yet willing to risk altering other services on the systems),
> but I checked and this is currently at 1677216.
>
> -This problem has been present since before some recent upgrades to the
> various components (was at the 1.38 level, I did a lot of upgrading to
> try to resolve this issue).
>
> All I know is that everything is pointing to the Bacula-Windows-Remote
> combination as having the problem. I would appreciate any advice on
> some other settings I can try, and I am certainly willing to experiment
> or provide what additional information I can to help out.
>
>
> Thanks for your help, and for a really slick network backup product.
>
> Marc
> Gridshield, S.A.
>
>
>
>
>
>
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